The "Somasila Dam" is a dam constructed across the Penna River near Somasila, Nellore district, Andhra Pradesh, India.

The reservoir impounded by the dam has a surface area of 212.28 km2 (52,456 acres) with live storage capacity of 1.994 km3 (1,616,562 acre⋅ft) or 75 tmcft.

It is the biggest storage reservoir in Penna River basin and can store all the inflows from its catchment area in a normal year.

Under Indian Rivers Inter-link projects, it is planned to connect the reservoir with the Nagarjunasagar reservoir to augment its water inflows.

[citation needed] It is nearly 79 kilometers distance from the District Headquarters.